 16 Feb 2022, Marius Koeppel, Bug Report, Writting MIDAS Events via FPGAs
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I just came back to this and started to use the dummy frontend.
Unfortunately, I have a problem during run cycles:
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07 Mar 2022, Marius Koeppel, Bug Report, Writting MIDAS Events via FPGAs
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> This problem has (likely) been fixed in the current version. Please pull develop and try again. Was a recursive call to the event collection routine which
is only triggered if you send events faster than
> the logger can digest, so not many people see it.
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25 Mar 2022, Marius Koeppel, Bug Report, Writting MIDAS Events via FPGAs
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I finally found the problem why the readout stops after a run transition.
In my dummy frontend the serial number was not reset to zero at run start.
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27 Apr 2023, Marius Koeppel, Suggestion, Maximum ODB size
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Hi all,
> I agree, I think we can safely bump the limit from 100 Mbytes to 1 Gbyte, maybe 1.5 or
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27 Apr 2023, Marius Koeppel, Suggestion, Maximum ODB size
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> This is change is wrong. As I wrote, ODB is not 64-bit clean and it is not 32-bit clean. We think is is 31-bit clean, so maximum size would be slightly
less than 2 Gbytes.
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28 Apr 2023, Marius Koeppel, Suggestion, Maximum ODB size 
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> my vote is to bump the ODB size limit to 1999*1000*1000 (not quite 2GB). but this needs to be tested. especially save and restore from ODB, XML and JSON
files, including how long it takes to save and load a 1.9GB ODB. K.O.
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28 Apr 2023, Marius Koeppel, Suggestion, Maximum ODB size
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> At the run start mlogger writes the ODB to the .mid file. This needs conversion (binary ODB -> XML ASCII) which can take time.
> This does NOT depend on the ODB size, but on the ODB *content*. Every key in the ODB takes time to convert. So if your ODB as 1.5 GB
> but only a few keys, this is still fast. Only if you have 200 million keys int he ODB, then mlogger takes lots of time to convert
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13 Jun 2023, Marius Koeppel, Suggestion, Maximum ODB size
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> BTW, how do I resize the ODB. I remember we discussed this some time ago, and concluded that odbedit needs a resize flag. Has this even been
> done? If not, what is the "official" way to resize the ODB. We had some documentation about that some time ago, but I can't find it anymore.
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 30 Aug 2024, Marius Koeppel, Suggestion, Improve Event Documentation
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Hi,
I am writing a Rust based midas file reader however it was kind of hard to understand the full midas file
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01 Sep 2024, Marius Koeppel, Suggestion, Improve Event Documentation
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> > Hi,
> >
> > I am writing a Rust based midas file reader however it was kind of hard to understand the full midas file
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02 Sep 2024, Marius Koeppel, Suggestion, Improve Event Documentation
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> > I am writing a Rust based midas file reader
>
> You might find this library I wrote useful: https://crates.io/crates/midasio
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16 Sep 2024, Marius Koeppel, Bug Report, Crash using ODB watch
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This is not the case here. Note that the error message: "Callback received for a midas::odb object which went out of scope" is not called! The segmentation
fault happens later line 96.
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16 Sep 2024, Marius Koeppel, Bug Report, Crash using ODB watch
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Okay, but this is then a big issue IMO. For Mu3e we do this in every frontend and I also checked again all of these watches are broken at the moment (with
commit 3ad98c5 they worked).
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18 Sep 2024, Marius Koeppel, Bug Report, Crash using ODB watch
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I created a PR to fix this issue https://bitbucket.org/tmidas/midas/pull-requests/42.
The crash happened since the change in commit 3ad98c5 always got the ODB via XML.
However, the creation from XML should only be used when a user wants to read fast (and when we are on a remote machine) so I added the flag use_from_xml |
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13 Dec 2024, Marius Koeppel, Info, New Feature: Message Search
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Dear all,
a new feature was implemented which allows to search the log messages in MIDAS. Attached one can find a more detailed explanation of how to use the feature.
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25 Nov 2020, Marco Francesconi, Suggestion, ODBSET wildcards with array keys in Sequencer files
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Hi,
I guess the issue is in the "[?]" part of the command, the indexing is handled differently from the odb path and does not
support "?".
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25 Nov 2020, Marco Francesconi, Suggestion, ODBSET wildcards with array keys in Sequencer files
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I created some keys in my ODB to try to match yours.
The ODBSET commands you wrote are all working fine (of course with different results), except only for the "/Detectors/Det*/Settings/Charge/Bias (V)*"
which I will have to
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30 Nov 2020, Marco Francesconi, Suggestion, ODBSET wildcards with array keys in Sequencer files
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I totally agree that we should have a consistent formatting for array index expansion.
I had a look to the mjsonrpc code and I found the function parse_array_index_list(...) which does this job.
I have a similar function (adapted form previous code) in odb.cxx called strarrayindex(...) that is designed for the same "consistency" purposes between |
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16 Jun 2021, Marco Francesconi, Info, 1000 Mbytes/sec through midas achieved!
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As reported by Stefan, in MEG II we have very similar ethernet throughputs.
In total, we have 34 crates each with 32 DRS4 digitiser chips and a single 1 Gbps readout link through a Xilinx Zynq SoC.
The data arrives in push mode without any external intervention, the only throttling being an optional prescaling on the trigger rate.
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25 Jun 2021, Marco Francesconi, Bug Fix, changes in history plots
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We are using the new history formula as a quick way to convert signals from sensors to actual physical values (for example Voltage->Temperature, Voltage->relative
humidity
...), so it is great that the shown voltage is the calculated one.
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